> This thundering herd problem can be solved in userland, if I am not
> mistaken. From what I've read, Apache solves this problem by having
> a single task do the select(), and setting an appropriate semaphore
> on return. The rest of the tasks which would normally do a select()
> instead wait on this semaphore -- when the semaphore is available,
> a single task is unblocked from waiting on it.
Besides being an ugly guru trick, this solution involves the extra
overhead of a semaphore and a process to manage it.
I'm fairly sure this wouldn't take even a kB of kernel memory,
and it would really be nice for userspace hackers to have.
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